Grasas y Aceites, Vol 51, No 3 (2000)

Thermal stability of 7-trimethylsilylperoxy-cholest-5-ene 3b-acetates at high temperature


https://doi.org/10.3989/gya.2000.v51.i3.473

R. Botolomeazzi
Department of Food Science, University of Udine, Via Marangoni, 97. Udine, Italy, Italy

L. Pizzale
Department of Food Science, University of Udine, Via Marangoni, 97. Udine, Italy, Italy

G. Lercker
Institute of Agrarian Industries, University of Bologna, Via S. Giacomo, 7. Bologna, Italy, Italy

Abstract


The thermal degradation of the two hydroperoxy isomers (7a- and 7b-hydroperoxides) of cholest-5-ene 3b-acetate (CA) generates many products, of which most have already been identified; the two 7-hydroxy-CA a- and b-isomers are among these compounds. In the case of the 7a-hydroperoxy-CA degradation, the isomer 7a-hydroxy-CA is present in a high proportion, while the 7b-isomer is generated in a larger amount from the 7b-hydroperoxy-CA. The thermal degradation of the trimethylsilyl derivatives (TMS) of the 7-hydroperoxy-CA gives rise to many products, of which several components are the same as those obtained from the corresponding non silylated 7-hydroperoxy-CA isomer. We have found an unexpectedly high amount of the TMS derivative of the 7-hydroperoxy-CA (7a- or 7b-isomers). Traces of free 7a-hydroperoxy-CA, from thermal degradation of each 7-hydroperoxide-CA TMS (7a- and 7b-isomers), were also found.

Keywords


Cholesteryl acetate; Gas chromatography; Mass spectrometry; Oxidation; Thermal stability

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